Very precise and specially designed for ultra low levels
0, 0.02, 0.05, 0.1, 0.2, 0.3, 0.5, 0.75, 1.0, 2.0, 5.0 ppm Fe
Tube of 25 strips
dip test strip into sample for 30 seconds with constant back and forth motion, remove strip, wait 2 minutes, then view through the aperture to match with closest color.
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